Add integration reference field to group copy method (#1283)

The group copy method now includes the IntegrationReference field in its output. This change was made to ensure that the integration reference information is retained when a group instance is copied, which previously was not the case.

management/server/group.go

@@ -49,6 +49,7 @@ func (g *Group) Copy() *Group {
 		Name:                 g.Name,
 		Issued:               g.Issued,
 		Peers:                make([]string, len(g.Peers)),
+		IntegrationReference: g.IntegrationReference,
 	}
 	copy(group.Peers, g.Peers)
 	return group